The current codegen code to support VF's that are multiples of a simdclone
simdlen rely on BIT_FIELD_REF to create multiple input vectors. This does not
work for non-constant simdclones, so we should disable using such clones when
the VF is a multiple of the non-constant simdlen until we change the codegen to
support those.
gcc/ChangeLog:
* tree-vect-stmts.cc (vectorizable_simd_clone_call): Reject simdclones
with non-constant simdlen when VF is not exactly the same.
---
gcc/tree-vect-stmts.cc | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/gcc/tree-vect-stmts.cc b/gcc/tree-vect-stmts.cc
index 2d0da6f0a0e..961421fee25 100644
--- a/gcc/tree-vect-stmts.cc
+++ b/gcc/tree-vect-stmts.cc
@@ -4149,7 +4149,10 @@ vectorizable_simd_clone_call (vec_info *vinfo,
stmt_vec_info stmt_info,
if (!constant_multiple_p (vf * group_size, n->simdclone->simdlen,
&num_calls)
|| (!n->simdclone->inbranch && (masked_call_offset > 0))
- || (nargs != simd_nargs))
+ || (nargs != simd_nargs)
+ /* Currently we do not support multiple calls of non-constant
+ simdlen as poly vectors can not be accessed by BIT_FIELD_REF. */
+ || (!n->simdclone->simdlen.is_constant () && num_calls != 1))
continue;
if (num_calls != 1)
this_badness += floor_log2 (num_calls) * 4096;
--
2.34.1
